Command Tool & Banner Tool

Command Tool: The Command Tool is the icon at the bottom with the crown on it.

If you left-click a colonist with it, you can see where they want to go currently. Generally this will be the Job Block assigned to them, a Bed, Grocery Store, Tool Shop, or the Banner. Left-click somewhere else to clear it.

If you click somewhere else, you open the Command Tool menu, and can assign an "area" for your colonists to work in. Most of these relate to farming. To define the area, you select one corner, then the other. For farming, you only need a height of 1 layer. If you left click an area with the Command Tool, it will ask if you want to remove an area. If you don't have one of the construction jobs selected, you can right-click the area to access the menu for the Berry Farmer, Beekeeper, or Chicken Farmer like normal job blocks. Area jobs do not use tools.

Construction: Builder: You select a block, and your workers will fill in open areas with this block. You must select an open area for each corner. Digger: The defined area will have everything removed from it. To make this easier, you may wish to use a block like a log or crate to help define the corners if there isn't anything there. After digging a block, it won't go over the same block again, so if you needed to place the construction workers above, you can re-place the ground and job to keep going. Special Digger: Same as normal, but only digs the selected block. Use this with Dark Stone to reveal all the ores in an area. Construction Job: Creates a 1x1x1 area job for 1 of your colonists to work on the above 3 jobs. You'll probably want to assign multiple, depending on the size of the job. Place crates nearby, as they need them frequently. If you're working away from the rest of the colony a grocery store is a good idea too. You can only place these next to (any layer), above, or 1 layer below a construction area.

Banner Tool: The Banner Tool is the icon with a banner on it at the bottom of the screen.

If you click on the ground outside of an existing outpost/colony, it will give you the option to start a new one of either, assuming you have the proper item: Outpost Banner/Colony Starter Kit (you don't need one for the first colony). If you're within range of one, you can also: go to the colony management screen, or move the banner to the current location.

While selected, you can see the brighter "safe area" where monsters will not spawn at night, which at the beginning ends at 30 blocks in each direction from the flag, and can be increased up to 100. This only takes effect once there are any colonists at that outpost/colony.